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SubjectRe: [PATCH 1/2] arm64: dts: sdm845: Add minimal dts/dtsi files for sdm845 SoC and MTP
On 01/25, Rajendra Nayak wrote:
> create mode 100644 arch/arm64/boot/dts/qcom/sdm845-mtp.dts
> create mode 100644 arch/arm64/boot/dts/qcom/sdm845-mtp.dtsi

Do we really need two files? Maybe collapse the two?

> create mode 100644 arch/arm64/boot/dts/qcom/sdm845.dtsi
> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> new file mode 100644
> index 000000000000..a21f4912b3e2
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> @@ -0,0 +1,308 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2018, The Linux Foundation. All rights reserved.
> + */
> +
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +/ {
> + model = "Qualcomm Technologies, Inc. SDM845";
> +
> + interrupt-parent = <&intc>;
> +
> + #address-cells = <2>;
> + #size-cells = <2>;
> +
> + chosen { };
> +
> + memory {
> + device_type = "memory";
> + /* We expect the bootloader to fill in the reg */
> + reg = <0 0 0 0>;
> + };
> +
> + cpus {
> + #address-cells = <2>;
> + #size-cells = <0>;
> +
> + CPU0: cpu@0 {
> + device_type = "cpu";
> + compatible = "qcom,kryo";
> + reg = <0x0 0x0>;
> + enable-method = "psci";
> + next-level-cache = <&L2_0>;
> + L2_0: l2-cache {
> + compatible = "cache";
> + next-level-cache = <&L3_0>;
> + L3_0: l3-cache {
> + compatible = "cache";
> + };
> + };
> + };
> +
> + CPU1: cpu@100 {
> + device_type = "cpu";
> + compatible = "qcom,kryo";
> + reg = <0x0 0x100>;
> + enable-method = "psci";
> + next-level-cache = <&L2_100>;
> + L2_100: l2-cache {
> + compatible = "cache";
> + next-level-cache = <&L3_0>;
> + };
> + };
> +
> + CPU2: cpu@200 {
> + device_type = "cpu";
> + compatible = "qcom,kryo";
> + reg = <0x0 0x200>;
> + enable-method = "psci";
> + next-level-cache = <&L2_200>;
> + L2_200: l2-cache {
> + compatible = "cache";
> + next-level-cache = <&L3_0>;
> + };
> + };
> +
> + CPU3: cpu@300 {
> + device_type = "cpu";
> + compatible = "qcom,kryo";
> + reg = <0x0 0x300>;
> + enable-method = "psci";
> + next-level-cache = <&L2_300>;
> + L2_300: l2-cache {
> + compatible = "cache";
> + next-level-cache = <&L3_0>;
> + };
> + };
> +
> + CPU4: cpu@400 {
> + device_type = "cpu";
> + compatible = "qcom,kryo";
> + reg = <0x0 0x400>;
> + enable-method = "psci";
> + next-level-cache = <&L2_400>;
> + L2_400: l2-cache {
> + compatible = "cache";
> + next-level-cache = <&L3_0>;
> + };
> + };
> +
> + CPU5: cpu@500 {
> + device_type = "cpu";
> + compatible = "qcom,kryo";
> + reg = <0x0 0x500>;
> + enable-method = "psci";
> + next-level-cache = <&L2_500>;
> + L2_500: l2-cache {
> + compatible = "cache";
> + next-level-cache = <&L3_0>;
> + };
> + };
> +
> + CPU6: cpu@600 {
> + device_type = "cpu";
> + compatible = "qcom,kryo";
> + reg = <0x0 0x600>;
> + enable-method = "psci";
> + next-level-cache = <&L2_600>;
> + L2_600: l2-cache {
> + compatible = "cache";
> + next-level-cache = <&L3_0>;
> + };
> + };
> +
> + CPU7: cpu@700 {
> + device_type = "cpu";
> + compatible = "qcom,kryo";
> + reg = <0x0 0x700>;
> + enable-method = "psci";
> + next-level-cache = <&L2_700>;
> + L2_700: l2-cache {
> + compatible = "cache";
> + next-level-cache = <&L3_0>;
> + };
> + };
> +
> + cpu-map {
> + cluster0 {
> + core0 {
> + cpu = <&CPU0>;
> + };
> +
> + core1 {
> + cpu = <&CPU1>;
> + };
> +
> + core2 {
> + cpu = <&CPU2>;
> + };
> +
> + core3 {
> + cpu = <&CPU3>;
> + };
> + };
> +
> + cluster1 {
> + core0 {
> + cpu = <&CPU4>;
> + };
> +
> + core1 {
> + cpu = <&CPU5>;
> + };
> +
> + core2 {
> + cpu = <&CPU6>;
> + };
> +
> + core3 {
> + cpu = <&CPU7>;
> + };
> + };
> + };

From what I recall, this layout causes the kernel to spew
warnings? I mean to say this is the power/performance view, but
not the architectural view.

> + };
> +
> + timer {
> + compatible = "arm,armv8-timer";
> + interrupts = <GIC_PPI 1 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>,

Are we supposed to use the GIC_CPU_MASK_SIMPLE macros still?

> + <GIC_PPI 2 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>,
> + <GIC_PPI 3 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>,
> + <GIC_PPI 0 (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>;
> + };
> +
> + clocks {
> + xo_board: xo_board {
> + compatible = "fixed-clock";
> + #clock-cells = <0>;
> + clock-frequency = <19200000>;
> + clock-output-names = "xo_board";

We can drop clock-output-names on these.

> + };
> +
> + sleep_clk: sleep_clk {
> + compatible = "fixed-clock";
> + #clock-cells = <0>;
> + clock-frequency = <32764>;
> + clock-output-names = "sleep_clk";
> + };
> + };
> +
> + psci {
> + compatible = "arm,psci-1.0";
> + method = "smc";
> + };
> +
> + soc: soc {

Will anyone use this phandle?

> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges = <0 0 0 0xffffffff>;
> + compatible = "simple-bus";
> +
> + intc: interrupt-controller@17a00000 {
> + compatible = "arm,gic-v3";
> + #interrupt-cells = <3>;
> + interrupt-controller;
> + #redistributor-regions = <1>;
> + redistributor-stride = <0x0 0x20000>;
> + reg = <0x17a00000 0x10000>, /* GICD */
> + <0x17a60000 0x100000>; /* GICR * 8 */
> + interrupts = <GIC_PPI 9 IRQ_TYPE_LEVEL_HIGH>;

Can you also add the ITS node please and mark it as disabled?
I'll send a patch to the list to skip status = "disabled" ones.
We may want to support ITS on these SoCs if the firmware is
different.

> + };
> +
> + gcc: clock-controller@100000 {
> + compatible = "qcom,gcc-sdm845";
> + reg = <0x100000 0x1f0000>;
> + #clock-cells = <1>;
> + #reset-cells = <1>;
> + };
> +
> + tlmm: pinctrl@03400000 {

Drop leading zeroes please.

> + compatible = "qcom,sdm845-pinctrl";
> + reg = <0x03400000 0xc00000>;
> + interrupts = <GIC_SPI 208 IRQ_TYPE_NONE>;
> + gpio-controller;
> + #gpio-cells = <2>;
> + interrupt-controller;
> + #interrupt-cells = <2>;
> + };
> +
> + timer@17C90000 {

Lowercase hex please.

> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges;
> + compatible = "arm,armv7-timer-mem";
> + reg = <0x17C90000 0x1000>;

Lowercase hex please.

> + clock-frequency = <19200000>;

Drop this? Or we can't read it from the hardware so we have to
hardcode it?

> +
> + frame@17CA0000 {

Lowecase again.

> + frame-number = <0>;
> + interrupts = <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>,
> + <GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>;
> + reg = <0x17CA0000 0x1000>,
> + <0x17CB0000 0x1000>;
> + };
> +

--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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